I do not know if this helps you, but I once had this same error and it was due to the requests_pathname_prefix field in my Dash app.
See my question here: Mod_wsgi and dash - virtual host configuration
I do not know if this helps you, but I once had this same error and it was due to the requests_pathname_prefix field in my Dash app.
See my question here: Mod_wsgi and dash - virtual host configuration